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Hi Robert,
These are sinilar to a mak cass but use a design known as Klevtsov. Where a conventional Mak Cass uses a Maksutov corrector at the front of the tube, the Klevtsov uses a mangin lens placed in front of the secondary mirror to correct for spherical aberration. These are similar to the TAL Cassegrains. They are quite a good scope for planetary imaging but they are not a Mewlon.
Cheers
John B
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